In other words, the warnings found with Xilinx synthesis are not found during the synthesis with Precision (this means that not all warnings are really important). There are maybe more advantages of using Precision but I'm able to see only that synthesis is less strict than using Xilinx. This was a little bit annoying because it was necessary to change from one tool to another and to have a very good file organization in folders, what at the beginning is always something difficult to maintain. They explained to me that the first one, ModelSim, was only for simulation, the second one, Precision, was used during the synthesis, and the third one, Xilinx ISE, for the implementation. When I was studying they show me that for Xilinx FPGA development they were necessary 3 different kinds of software: ModelSim, Precision and Xilinx ISE. Note: In this text I will assume that you are using Xilinx FPGAs to develop your design, in the future I will talk about other useful tools to work with. Now it's time to choose which software to use for each step!
This will help also to debug if there is any unexpected error. So, I suggest you to simulate after the hardware description, the Translate and Map and obviously after the implementation into the FPGA. I'm sure even hardware design gurus are not able to go through all the steps without simulating till the end of the implementation and expect a proper running of the system. Next, describe it using a hardware description language and simulate it. As I told in the first post, in a first approximation you can simulate your system using a script language. Anyway, there is always a path you have to follow. It depends a lot on what are you more used to work with and what do you prefer or like.
To tell somebody what's better is quite difficult, basically because each has his own opinion of usability, ease, pragmatism, efficiency. And finally my opinion of which are the ones I use. In this first approach will be explained some advantages and disadvantages of using Xilinx ISE (+ ModelSim) or using ModelSim, Precision and Xilinx ISE. This post is related to the first post How to start in FPGA development? - Some tips which aimed to show other options to work on the simulation of your project.
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